Launcher launching on its own

How can I keep the launcher from launching on its own?

As the pistons for the launchers (ME-6800, ME-6801, ME-6825) age, the sharp edge that the trigger catches on can wear.  To have the trigger engage in a sharp section of the piston rim, gently rotate the piston within the launcher by about 45 degrees so that the entire surface that the trigger will engage with will have the sharper edge.  

The following video shows this process.

Rotating piston within launcher

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